Added More Comments on dust propagator file

Altered conversion of mean anomaly
Note: cpp file appears to work correctly
Merge branch 'test' of https://github.com/sethhirsh/Dust-Propagator into test

Conflicts:
	DustPropagator/CMakeLists.txt
	DustPropagator/body.h
	DustPropagator/dustPropagator.cpp